So I got my new Baader Classic Orthos. Wow! Big improvement over my Meade China made 4000 series. I am not so sure about the Baader Q Barlow. Need to test it further, but it certainly seemed no better than the Meade 126 cheap Barlow. I did not try it in the mode where you remove the bottom lens and attach it to the eyepice directly.
I noticed tonight that when looking at Jupiter I had a cross shaped (classic four point photography star filter) aberration on Jupiter. It was not based on the rotation of the eyepiece. It occurred in all the shorter eyepieces (18mm down). The seeing here in St Louis was very good.
I am wondering if it was the spider vanes, as I think it was aligned with them. I tried moving my hands around them to see if I could vary it, but I didn't see much change (wasn't sure if it was my neighbor's lights hitting the spider vanes, but I don't think so.) I need to make a aperture disc for this scope, but is this something that happens with bright bodies hitting the spider vanes? I recently collimated the scope, and I think I got it pretty nice, but I am no expert there. Was thinking a laser collimator would be a good investment, as this was with a Cheshire.
The scope is a LightBridge 12" Dob that is over 5 years old. It is one of the earlier models with silver truss poles (need to paint those).
The Baader Q-Turret does not seem to work with the focuser on my LightBridge. My focuser is the older one without the fine focus (grrr). With the turret I could not get the focus tube short enough to get things in focus.
Any thoughts? Thanks.
Edited by TinPusher, 12 July 2018 - 12:24 AM.